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Lithium ion battery

A technology for lithium ion batteries and battery shells, applied in lithium batteries, battery electrodes, non-aqueous electrolyte batteries, etc., can solve the problems of easy degradation, poor adhesion, poor battery capacity and cycle performance, etc., to improve flexibility, reduce Effects of internal resistance, good adhesion and stability

Active Publication Date: 2012-05-02
DONGFANG ELECTRIC CORP LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problems of poor adhesion, easy degradation, poor battery capacity and cycle performance of the water-soluble binder for preparing lithium-ion batteries in the prior art, and provide a low-cost, high-capacity and long-life battery. Lithium Ion Battery

Method used

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  • Lithium ion battery

Examples

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Embodiment 1

[0042] Composite water-soluble binder solution: the methylene oxide ethylene copolymer of 40% by weight (—(CH 2 (OCH 2 CH 2 ) m ) n —) and 60% by weight of polyvinyl nitrile (PAN) are uniformly mixed and then dissolved in deionized water to form a composite water-soluble binder solution. Its mass ratio is methylene oxide ethylene copolymer: polyvinyl nitrile: deionized water = 4:6:30.

[0043] Positive electrode composition: first make the thickener CMC into a 4% by weight aqueous solution, stir and mix with the conductive agent Super-P and flake graphite KS-6 for 1.5 hours, and then add nano-LiFePO 4 Mix well (D50=120nm), stir for 3 hours, then add 40% by weight of composite water-soluble binder solution, stir for 1 hour, and finally add 20% by weight of ethanol aqueous solution and stir for 30 minutes to obtain a water-based positive electrode, which is composed of LiFePO 4 : Conductive agent (Super-P / KS-6 / =3 / 1): CMC: Binder (Methylene oxide ethylene copolymer / polyvin...

Embodiment 2

[0060] Composite water-soluble binder solution: the methylene oxide ethylene copolymer of 10% by weight (—(CH 2 (OCH 2 CH 2 ) m ) n —) and 90% by weight of polyvinyl nitrile (PAN) are uniformly mixed and then dissolved in deionized water to form a composite water-soluble binder solution. Its mass ratio is methylene oxide ethylene copolymer: polyvinyl nitrile: deionized water = 1:9:30.

[0061] Positive electrode composition: first make the thickener CMC into a 4% by weight aqueous solution, stir and mix with the conductive agent Super-P and flake graphite KS-6 for 1.5 hours, and then add nano-LiFePO 4 Mix well (D50=120nm), stir for 3 hours, then add 40% by weight of composite water-soluble binder solution, stir for 1 hour, and finally add 20% by weight of ethanol aqueous solution and stir for 30 minutes to obtain a water-based positive electrode, which is composed of LiFePO 4 : Conductive agent (Super-P / KS-6 / =3 / 1): CMC: Binder (Methylene oxide ethylene copolymer / polyvin...

Embodiment 3

[0078] Composite water-soluble binder solution: the dimethylsiloxane-ethylene oxide copolymer of 10% by weight (—((CH 3 ) 2 (SiOOCH 2 CH 2 ) m ) n —) and 90% by weight of polyvinyl nitrile (PAN) are uniformly mixed and then dissolved in deionized water to form a composite water-soluble binder solution. Its mass ratio is dimethylsiloxane-ethylene oxide copolymer: polyvinyl nitrile: deionized water = 1:9:30.

[0079] Positive electrode composition: first make the thickener CMC into a 4% by weight aqueous solution, stir and mix with the conductive agent Super-P and flake graphite KS-6 for 1.5 hours, and then add nano-LiFePO 4 Mix well (D50=120nm), stir for 3 hours, then add 40% by weight of composite water-soluble binder solution, stir for 1 hour, and finally add 20% by weight of ethanol aqueous solution and stir for 30 minutes to obtain a water-based positive electrode, which is composed of LiFePO 4 : Conductive agent (Super-P / KS-6 / =3 / 1): CMC: Binder (Dimethicone-ethylen...

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Abstract

The invention relates to a lithium ion battery, belonging to the field of lithium ion batteries. In the manufacture of the battery, a composite water-soluble adhesive is used as an adhesive; the adhesive comprises the following components in percentage by weight: 10-40% of amorphous statepolyoxyethylene water-soluble adhesive and 60-90% of gel-type water-soluble adhesive; the amorphous statepolyoxyethylene water-soluble adhesive in the composite water-soluble adhesive has high flexibility, and the flexibility of a pole piece is improved, so that defects of material falling, cracking, crimping, chipping and the like occurring during the manufacture of poles can be reduced, and scale production can be performed favorably. The gel-type water-soluble adhesive has good cohesiveness and stability; the contacts between active substances and conductive agents and between active substances and current collectors are improved; and internal resistance of the battery is reduced. Therefore the composite water-soluble adhesive mentioned in the invention, positive poles containing the adhesive and lithium ion batteries using the composite water-soluble adhesive positive poles all have the advantages of high capacity and long service life.

Description

technical field [0001] The invention relates to a lithium ion battery and belongs to the field of lithium ion batteries. Background technique [0002] Compared with other chemical power sources, lithium-ion secondary batteries have many excellent properties, such as high energy density, long cycle life, high open circuit voltage, no memory effect, safety and pollution-free, etc. After nearly two decades of rapid development, they have become Widely used in mobile phones, notebook computers, digital cameras and other fields. In recent years, with the development of electric vehicles, there is an urgent need for vehicle power supplies with higher energy density and higher power density. Lithium-ion batteries are recognized as the most potential chemical power supply for electric vehicles. There are two ways to increase the energy density and power density of chemical batteries, one is to use high specific energy active materials; the other is to increase the content of active...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/052H01M4/62H01M4/13
CPCY02E60/122Y02E60/10
Inventor 谢皎阮晓莉王睿胡蕴成王荣贵
Owner DONGFANG ELECTRIC CORP LTD
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